motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-08 02:03:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

tcg: Split out tcg_out_goto_tb

Browse source 
The INDEX_op_goto_tb opcode needs no register allocation.
Split out a dedicated helper function for it.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-11-26 17:14:05 -08:00
parent becc452a36
commit cf7d6b8e98
11 changed files with 199 additions and 173 deletions
Download patch file Download diff file Expand all files Collapse all files

33
tcg/i386/tcg-target.c.inc
View file

@ -2358,6 +2358,22 @@ static void tcg_out_exit_tb(TCGContext *s, uintptr_t a0)
}
}
static void tcg_out_goto_tb(TCGContext *s, int which)
{
/*
* Jump displacement must be aligned for atomic patching;
* see if we need to add extra nops before jump
*/
int gap = QEMU_ALIGN_PTR_UP(s->code_ptr + 1, 4) - s->code_ptr;
if (gap != 1) {
tcg_out_nopn(s, gap - 1);
}
tcg_out8(s, OPC_JMP_long); /* jmp im */
set_jmp_insn_offset(s, which);
tcg_out32(s, 0);
set_jmp_reset_offset(s, which);
}
static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
const TCGArg args[TCG_MAX_OP_ARGS],
const int const_args[TCG_MAX_OP_ARGS])
@ -2382,22 +2398,6 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
const_a2 = const_args[2];
switch (opc) {
case INDEX_op_goto_tb:
{
/*
* Jump displacement must be aligned for atomic patching;
* see if we need to add extra nops before jump
*/
int gap = QEMU_ALIGN_PTR_UP(s->code_ptr + 1, 4) - s->code_ptr;
if (gap != 1) {
tcg_out_nopn(s, gap - 1);
}
tcg_out8(s, OPC_JMP_long); /* jmp im */
set_jmp_insn_offset(s, a0);
tcg_out32(s, 0);
}
set_jmp_reset_offset(s, a0);
break;
case INDEX_op_goto_ptr:
/* jmp to the given host address (could be epilogue) */
tcg_out_modrm(s, OPC_GRP5, EXT5_JMPN_Ev, a0);
@ -2792,6 +2792,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
case INDEX_op_mov_i64:
case INDEX_op_call: /* Always emitted via tcg_out_call. */
case INDEX_op_exit_tb: /* Always emitted via tcg_out_exit_tb. */
case INDEX_op_goto_tb: /* Always emitted via tcg_out_goto_tb. */
default:
tcg_abort();
}